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See Chinese contents: GB/T 6739-2022 GB/T 6739-2022: Paints and varnishes -- Determination of film hardness by pencil test
This Document specifies a method for determining the hardness of paint films by pushing a pencil of known hardness across the film. This Document is applicable to the determination of the paint film hardness of a single coating of paints, varnishes and related products; and is also applicable to the determination of the paint film hardness of the top layer of a multi-coating.
